TM-9-2320-280-34 HMMWV Direct Support & General Support Maintenance Manual Download
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TM 9-2320-280-34 17-29. OIL PUMP ASSEMBLY REPAIR (4L80-E) (Cont'd) c Inspection 1. Inspect pump body (1) for cracks, breaks, burrs, damaged threads, and chipped seal or snap ring grooves. Remove minor burrs. If damaged, replace oil pump. 2. Inspect pump body (1) gear pockets, crescent, bushings, and gear face for nicks, scoring, and wear. Repair minor nicks and scoring. If damaged, replace oil pump. 3. Inspect pump body (1) for blocked oil passages and ports and cross-channel leakage paths. Clear oil passages. If damaged, replace oil pump. 4. Install drive gear (3) and driven gear (2) in pump body (1) with chamfered edges down. Measure clearance of gears (3) and (2) to pump body (1) using a straight-edge and feeler gauge. Clearance should be 0.0007-0.0028 in. (0.017-0.071 mm). If clearance does not meet specifications, replace oil pump. 5. Inspect pump cover (6) for cracks, breaks, burrs, and chipped seal or snapring grooves. Remove minor burrs. If damaged, replace oil pump. 6. Inspect stator shaft (9) splines. Replace oil pump if damaged. 7. Inspect pump cover (6) for scored, discolored, or worn bushings. If damaged, replace oil pump. 8. Inspect pump cover (6) for chipped or broken oil seal ring grooves on hub. If damaged, replace oil pump. 9. Inspect pump cover (6) for blocked oil passages and ports, and cross-channel leakage paths. Clear oil passages. If damaged, replace oil pump. 10. Inspect pump cover (6) for blocked breather hole. Unblock hole if plugged. 11. Inspect that pressure regulator (7), converter limit (4), converter clutch (8), and converter enable valves (5) are not broken, burred, or chipped, and can move freely (dry) in cover (6). Replace any damaged items. 12 Inspect spring pins (10) for breaks, burrs, or chips. If damaged, replace oil pump. 17-126